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It's better to have 2 different voltage buses IMO. 36V would burn out relay contacts and switches pretty quick. If there are no more manual transmission cars left in the near future, I will do a hybrid conversion to my beloved stick shift cars and use a step down converter to power the original electrical systems.
Anyways, I'm pretty sure this is a cost thing. Flooded lead acid batteries need to be replaced a lot, but they cost the manufacturer very little money so they still put them in cars. You have the option of switching to AGM or LiFePO3 at your own expense obviously. I still think it's funny how the Porsche 911 GT3 comes with a lead acid battery standard when they are so obsessed with weight savings, when you could drop 50? pounds with the LiFePO battery option. Some bean counters got their way and were very happy that day.
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